DERIVATIVE INSTRUMENTS - Gains and Losses Recognized in OCI (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Cash flow hedging | Foreign exchange forward contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI	$ 1.3	$ 0.9	$ (0.3)
Cash flow hedging | Interest rate swap contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI	(50.3)	(47.4)	27.0
Cash flow hedging | Cross-currency swap contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI	(12.5)	0.0	0.0
Net investment hedge
Derivative [Line Items]
Gain (Loss) Recognized in OCI	$ 47.1	$ 99.8	$ 138.7